Journal of Physics: Conference Series
The magnetic-field-dependent ordering temperature of the quasi-2D quantum Heisenberg antiferromagnet (QHAF) Cu(pz)2(ClO4)2 was determined by calorimetric measurement in applied dc fields up to 33 tesla. The magnetic phase diagram shows a round maximum at 5.95 K and 17.5 T (at ≈ 1/3 of its saturation field), a 40 percent enhancement of the ordering temperature above the zero field value of 4.25 K. The enhancement and reentrance are consistent with predictions of a field-induced Heisenberg to XY crossover behavior for an ideal 2D QHAF system.
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Fortune, Nathanael Alexander; Hannahs, Scott T.; Landee, C. P.; Turnbull, M. M.; and Xiao, F., "Magnetic-field-induced Heisenberg to XY Crossover in a Quasi-2D Quantum Antiferromagnet" (2014). Physics: Faculty Publications, Smith College, Northampton, MA.